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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab33be04126320f0e625198a86fddf7f8aa0f125fa45683fafd8a2f9675edcf3' 
  AND token = '8Sl4dx/WKbczxSx6tQrdB3gc+4n7TghVtF3pqEwjbHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}